2/1+6/1+12/1+20/1+...+2450/1

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/11/09 03:56:37

1/2+1/6+1/12+1/20+……+1/2450
=1-1/2+1/2-1/3+1/3-1/4+……+1/49-1/50
=1-1/50
=49/50

1.1/2+1/6+1/12+1/20+.+1/2450= 1/2+1/6+1/12+1/20+.+1/9900 1/2,-1/6,1/12,-1/20,1/30 1/2+1/6+1/12+1/20+1/30 1/2+1/6+1/12+1/20（简算） 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 1/2+1/6+1/12+1\20+1/30+1/42+.+1/9900=? 1/2+1/6+1/12+1/20+1/30+1/42+1/56=? 1/2+1/6+1/12+1/20+1/30+1/42+1/56 简算 1/2+1/6+1/12+1/20+1/30+1/42+1/56 1+1/2+1/6+1/12+1/20+1/30+1/42的简便计算 1+1/2+1/6+1/12+1/20+1/30.+1/90